/Engine/Source/Editor/BlueprintGraph/Classes/K2Node_SpawnActor.h
Reallocate pins during reconstruction; by default ignores the old pins and callsAllocateDefaultPins()If you override this to create additional pins you likely need to call RestoreSplitPins to restore any pins that have been split (e.g. a vector pin split into its components)
virtual void ReallocatePinsDuringReconstruction ( [TArray](API\Runtime\Core\Containers\TArray)< [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * > & OldPins )